2020 Water Quality Data Table
Running Annual Average (RAA) or Highest Level Detected
MCL Violation Y/N
Range of All Samples (Low -High)
Sample Month & Year
Radiochemical Contaminants
Location(s)
MCL MCLG
Likely Source of Contaminant
Well 5b
4.2
Jul-17
Alpha Emitters (pCi/L) a& b
N
4.1 -9.7
15
0
Erosion of Natural Deposits
Well 1, 2, 2B, 3 & 4
7
Jul-20
Well 5b
1.2
Jul-17
Combined Radium 226 & 228 (pCi/L)
N
1.1 - 2.1
5
0
Erosion of Natural Deposits
Well 1, 2, 2B, & 4
1.5
Jul-20
Running Annual Average (RAA) or Highest Level Detected
Range of All Samples (Low -High)
Sample Month & Year
Inorganic Contaminants
Violation Yes/No
Location(s)
MCL MCLG
Likely Source of Contaminant
Well 8
3.6
Jul-17 Erosion of natural deposits, runoff from orchards, runoff from glass and electronics production wastes. Jul-20 Jul-17 Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits. Jul-20 Jul-17 Discharge from steel and pulp mills; Erosion of natural deposits. Jul-17 Erosion of natural deposits; Water additive that promotes strong teeth; Discharge from fertilizer and aluminum factories. Jul-20 May-20 Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits Jul-20 Jul-20
Arsenic (ppb)
N
1.7 - 7.9
10
0
Wells 1, 2B, 4, 5B
3.6
Wells 3 & 8
N
0.33
0.17 - 1.2
2
2
Barium (ppm)
Wells 1, 2B, 4, 5B
1.0
Wells 3 & 8
2.7
Chromium (ppb)
N
1.2 - 3.0
100
100
Wells 1, 2B, 4, & 5B
2.0
Wells 3 & 8
0.096
Fluoride (ppm)
N
0.060 - 0.120
4
4
Wells 1, 2B, 4, & 5B
0.057
Wells 2, 2b, 3, 5b, & 8
0.15
Nitrate (ppm)
N
0.11 - 0.23
10
10
Well 1
0.23
Nickel
Well 3
N
0.019
0.019
No MCL No MCL Jul-17 N/A
Wells 1, 2, 3**, & 8
4.6
Apr-18
Sodium (ppm)
Well 4
N
4.1
4.0 - 6.2
No MCL May-18
Erosion of natural deposits
Wells 2b and 5b
5.0
Jul-20
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